Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
4
health-based violations
25
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Resolved | 2011-07-01 → 2011-07-31 |
| MCL | Health-based | Resolved | 2011-07-01 → 2011-07-31 |
| MCL | Health-based | Resolved | 2011-07-01 → 2011-07-31 |
| MCL | Health-based | Resolved | 2011-07-01 → 2011-07-31 |
| MR | Monitoring | Resolved | 2018-10-01 → 2018-12-31 |
| MR | Monitoring | Resolved | 2018-10-01 → 2018-12-31 |
| MR | Monitoring | Resolved | 2018-10-01 → 2018-12-31 |
| MR | Monitoring | Resolved | 2018-10-01 → 2018-12-31 |
| MR | Monitoring | Resolved | 2009-06-01 → 2009-06-30 |
| MR | Monitoring | Resolved | 2009-06-01 → 2009-06-30 |
PFAS detected
PFAS are industrial “forever chemicals”. These are the EPA's latest
nationwide test results (2023–2025).
Other contaminants detected
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of this
system's samples — over 100% is worth reading, but is not by itself a
violation. Where a single sample came in higher than that percentile, it
is noted under the bar. Formal violations are listed separately.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 5760.5 µg/L 58% of the EPA limit 10000 µg/L
worst single sample: 7560 µg/L | 800/846 | SYR4 | 2012–2019 |
| Trichloroethylene | 10.035 µg/L 201% of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 17 µg/L | 514/1508 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 16.94 µg/L 339% of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 20 µg/L | 453/1394 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 5783 µg/L 58% of the EPA limit 10000 µg/L
worst single sample: 6500 µg/L | 259/282 | SYR4 | 2012–2019 |
| cis-1,2-Dichloroethylene | 23.41 µg/L 33% of the EPA limit 70 µg/L
worst single sample: 33.3 µg/L | 230/1690 | SYR4 | 2012–2019 |
| 1,1-Dichloroethylene | 7.5 µg/L 107% of the EPA limit, at the 95th percentile of samples — 7 µg/L
worst single sample: 26.9 µg/L | 204/1690 | SYR4 | 2012–2019 |
| 1,1,1-Trichloroethane | 1.7 µg/L 0.9% of the EPA limit 200 µg/L
worst single sample: 2.13 µg/L | 176/1691 | SYR4 | 2012–2019 |
| Barium | 62.05 µg/L 3.1% of the EPA limit 2000 µg/L
worst single sample: 78.3 µg/L | 160/199 | SYR4 | 2012–2019 |
| Vinyl Chloride | 1.8 µg/L 90% of the EPA limit 2 µg/L
worst single sample: 2.5 µg/L | 140/1691 | SYR4 | 2012–2019 |
| Chlorobenzene | 1.4975 µg/L 1.5% of the EPA limit 100 µg/L
worst single sample: 1.8 µg/L | 126/1691 | SYR4 | 2012–2019 |
| Copper | 143.5 µg/L 11% of the EPA limit 1300 µg/L
worst single sample: 900 µg/L | 114/198 | SYR4 | 2012–2019 |
| Dibromochloromethane | 4.1 µg/L No EPA limit set
worst single sample: 5 µg/L | 83/296 | SYR4 | 2012–2019 |
| Bromoform | 5.9 µg/L No EPA limit set
worst single sample: 10.9 µg/L | 71/297 | SYR4 | 2012–2019 |
| Bromodichloromethane | 1.605 µg/L No EPA limit set
worst single sample: 2.2 µg/L | 60/297 | SYR4 | 2012–2019 |
| TTHM | 12.21 µg/L 15% of the EPA limit 80 µg/L
worst single sample: 15.3 µg/L | 60/273 | SYR4 | 2012–2019 |
| Combined Uranium | 7.06016 µg/L 24% of the EPA limit 30 µg/L
worst single sample: 9.3274 µg/L | 53/65 | SYR4 | 2012–2019 |
| Carbon Tetrachloride | 2.02 µg/L 40% of the EPA limit 5 µg/L
worst single sample: 7.2 µg/L | 49/1692 | SYR4 | 2012–2019 |
| P-Dichlorobenzene | 0.7000 µg/L 0.9% of the EPA limit 75 µg/L
worst single sample: 0.8700 µg/L | 48/1692 | SYR4 | 2012–2019 |
| Gross Beta Particle Activity | 5.658 pCi/L No EPA limit set
worst single sample: 6.22 pCi/L | 45/47 | SYR4 | 2012–2019 |
| Ethylene Dibromide | 0.0300 µg/L 60% of the EPA limit 0.0500 µg/L
worst single sample: 0.0510 µg/L | 43/186 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 2.94 µg/L No EPA limit set
worst single sample: 3.7 µg/L | 40/71 | SYR4 | 2012–2018 |
| 1,2-Dichloroethane | 0.7490 µg/L 15% of the EPA limit 5 µg/L
worst single sample: 1.4 µg/L | 32/1692 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 3.835 µg/L 6.4% of the EPA limit 60 µg/L
worst single sample: 5.9 µg/L | 32/47 | SYR4 | 2017–2018 |
| Combined Radium (-226 And -228) | 4.67 pCi/L 93% of the EPA limit 5 pCi/L
worst single sample: 5.4 pCi/L | 31/65 | SYR4 | 2012–2019 |
| Heptachlor Epoxide | 0.0435 µg/L 22% of the EPA limit 0.2000 µg/L
worst single sample: 0.0470 µg/L | 31/136 | SYR4 | 2012–2019 |
| Lead | 4.77 µg/L 32% of the EPA limit 15 µg/L
worst single sample: 11.4 µg/L | 23/198 | SYR4 | 2012–2019 |
| Chloroform | 3.26 µg/L No EPA limit set
worst single sample: 3.5 µg/L | 13/297 | SYR4 | 2012–2019 |
| Selenium | 2.86 µg/L 5.7% of the EPA limit 50 µg/L
worst single sample: 3.1 µg/L | 13/200 | SYR4 | 2012–2019 |
| Lead | 0.0014 mg/L 9.3% of the EPA limit 0.0150 mg/L | 11/11 | LCR | 2024 |
| Gross Alpha, Excl. Radon And U | 2.19 pCi/L 15% of the EPA limit 15 pCi/L
worst single sample: 2.26 pCi/L | 6/66 | SYR4 | 2012–2019 |
| Fluoride | 127 µg/L 3.2% of the EPA limit 4000 µg/L
worst single sample: 130 µg/L | 4/199 | SYR4 | 2012–2019 |
| Dichloromethane | 0.6425 µg/L 13% of the EPA limit 5 µg/L
worst single sample: 0.6500 µg/L | 2/1692 | SYR4 | 2012–2019 |
| Nitrite | 147 µg/L 15% of the EPA limit 1000 µg/L
worst single sample: 150 µg/L | 2/284 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 2.98 µg/L No EPA limit set
worst single sample: 3 µg/L | 2/71 | SYR4 | 2012–2018 |
| Di(2-ethylhexyl) Phthalate | 0.7600 µg/L 13% of the EPA limit 6 µg/L | 1/99 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 1.1 µg/L No EPA limit set | 1/71 | SYR4 | 2012–2018 |
| Endrin | 0.0630 µg/L 3.2% of the EPA limit 2 µg/L | 1/99 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 3 µg/L No EPA limit set | 1/71 | SYR4 | 2012–2018 |
| Thallium, Total | 0.3400 µg/L 17% of the EPA limit 2 µg/L | 1/200 | SYR4 | 2012–2019 |
| Toluene | 11.3 µg/L 1.1% of the EPA limit 1000 µg/L | 1/1692 | SYR4 | 2012–2019 |
64 contaminants tested, none detected
1,1,2-Trichloroethane1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalCyanideCadmiumCarbofuranChlordaneChromiumDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEndothallEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaOxamylPfdaPfdoaPfeesaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTotal Polychlorinated Biphenyls (PCB)ToxapheneLithiumO-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Wa of Western Nassau
Is Wa of Western Nassau tap water safe to drink?
EPA monitoring detected 48 contaminants in Wa of Western Nassau's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in Wa of Western Nassau's water?
EPA monitoring detected Nitrate, Trichloroethylene, Tetrachloroethylene, Nitrate-Nitrite, cis-1,2-Dichloroethylene, and others. The full list with the level and data source for each is above.
How many people does Wa of Western Nassau serve?
Wa of Western Nassau reports serving 120,000 people in New York, per its EPA record.
Has Wa of Western Nassau had any water quality violations?
The EPA has 25 violations on file for Wa of Western Nassau, of which 4 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.